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/* Chrysalide - Outil d'analyse de fichiers binaires
* ##FILE## - traduction d'instructions ARMv7
*
* Copyright (C) 2015 Cyrille Bagard
*
* This file is part of Chrysalide.
*
* Chrysalide is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* Chrysalide is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Foobar. If not, see <http://www.gnu.org/licenses/>.
*/
@title LDRSB (immediate)
@desc Load Register Signed Byte (immediate) calculates an address from a base register value and an immediate offset, loads a byte from memory, sign-extends it to form a 32-bit word, and writes it to a register. It can use offset, post-indexed, or pre-indexed addressing. For information about memory accesses see Memory accesses on page A8-294.
@encoding (T1) {
@word 1 1 1 1 1 0 0 1 1 0 0 1 Rn(4) Rt(4) imm12(12)
@syntax <reg_T> <mem_access>
@conv {
reg_T = Register(Rt)
reg_N = Register(Rn)
imm32 = ZeroExtend(imm12, 32)
mem_access = MakeMemoryAccess(reg_N, imm32, NULL, true, true, false)
}
}
@encoding (T2) {
@word 1 1 1 1 1 0 0 1 0 0 0 1 Rn(4) Rt(4) 1 P(1) U(1) W(1) imm8(8)
@syntax <reg_T> <mem_access>
@conv {
reg_T = Register(Rt)
reg_N = Register(Rn)
imm32 = ZeroExtend(imm8, 32)
index = (P == '1')
add = (U == '1')
wback = (W == '1')
mem_access = MakeMemoryAccess(reg_N, imm32, NULL, index, add, wback)
}
}
@encoding (A1) {
@word cond(4) 0 0 0 P(1) U(1) 1 W(1) 1 Rn(4) Rt(4) imm4H(4) 1 1 0 1 imm4L(4)
@syntax <reg_T> <mem_access>
@conv {
reg_T = Register(Rt)
reg_N = Register(Rn)
imm32 = ZeroExtend(imm4H:imm4L, 32)
index = (P == '1')
add = (U == '1')
wback = (P == '0') || (W == '1')
mem_access = MakeMemoryAccess(reg_N, imm32, NULL, index, add, wback)
}
@rules {
chk_call StoreCondition(cond)
}
}
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